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            <h2 class="title" style="clear: both"><a id="xa_xa_intro"></a>XA Introduction</h2>
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      <p>
        Berkeley DB can be used as an XA-compliant resource manager.
        The XA implementation is known to work with the Tuxedo
        transaction manager.
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      <p>
        The XA support is encapsulated in the resource manager
        switch db_xa_switch, which defines the following
        functions:
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          <li><span class="emphasis"><em>__db_xa_close.</em></span>
            Close the resource manager.
        </li>
          <li><span class="emphasis"><em>__db_xa_commit. </em></span>
            Commit the specified transaction.
        </li>
          <li><span class="emphasis"><em>__db_xa_complete.</em></span>
            Wait for asynchronous operations to complete.
        </li>
          <li><span class="emphasis"><em>__db_xa_end. </em></span>
            Disassociate the application from a
            transaction.
        </li>
          <li><span class="emphasis"><em>__db_xa_forget.</em></span>
            Forget about a transaction that was heuristically
            completed. (Berkeley DB does not support heuristic
            completion.)
        </li>
          <li><span class="emphasis"><em>__db_xa_open.</em></span> Open
            the resource manager.
        </li>
          <li><span class="emphasis"><em>__db_xa_prepare.</em></span>
            Prepare the specified transaction.
        </li>
          <li><span class="emphasis"><em>__db_xa_recover.</em></span>
            Return a list of prepared, but not yet committed
            transactions.
        </li>
          <li><span class="emphasis"><em>__db_xa_rollback.</em></span>
            Abort the specified transaction.
        </li>
          <li><span class="emphasis"><em>__db_xa_start.</em></span>
            Associate the application with a transaction.
        </li>
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      <p>
        The Berkeley DB resource manager does not support the
        following optional XA features:
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          <li>
            Asynchronous operations
        </li>
          <li>
            Transaction migration
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      <p>
        The Tuxedo System is available from <a class="ulink" href="http://www.oracle.com/us/corporate/Acquisitions/bea/index.html" target="_top">Oracle BEA
        Systems</a>.
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